/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id$
 */
package wx.xml.xalan.xalan.templates;

import wx.xml.xalan.xpath.XPathVisitor;

/**
 * A derivation from this class can be passed to a class that implements
 * the XSLTVisitable interface, to have the appropriate method called
 * for each component of an XSLT stylesheet.  Aside from possible other uses,
 * the main intention is to provide a reasonable means to perform expression
 * rewriting.
 */
public class XSLTVisitor extends XPathVisitor {
    /**
     * Visit an XSLT instruction.  Any element that isn't called by one
     * of the other visit methods, will be called by this method.
     *
     * @param elem The xsl instruction element object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitInstruction(ElemTemplateElement elem) {
        return true;
    }

    /**
     * Visit an XSLT stylesheet instruction.
     *
     * @param elem The xsl instruction element object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitStylesheet(ElemTemplateElement elem) {
        return true;
    }


    /**
     * Visit an XSLT top-level instruction.
     *
     * @param elem The xsl instruction element object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitTopLevelInstruction(ElemTemplateElement elem) {
        return true;
    }

    /**
     * Visit an XSLT top-level instruction.
     *
     * @param elem The xsl instruction element object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitTopLevelVariableOrParamDecl(ElemTemplateElement elem) {
        return true;
    }


    /**
     * Visit an XSLT variable or parameter declaration.
     *
     * @param elem The xsl instruction element object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitVariableOrParamDecl(ElemVariable elem) {
        return true;
    }

    /**
     * Visit a LiteralResultElement.
     *
     * @param elem The literal result object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitLiteralResultElement(ElemLiteralResult elem) {
        return true;
    }

    /**
     * Visit an Attribute Value Template (at the top level).
     *
     * @param elem The attribute value template object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitAVT(AVT elem) {
        return true;
    }


    /**
     * Visit an extension element.
     *
     * @param elem The extension object.
     * @return true if the sub expressions should be traversed.
     */
    public boolean visitExtensionElement(ElemExtensionCall elem) {
        return true;
    }

}

